To: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
References: <5760259B.7040409@mycelium.com>
From: Daniel Weigl <Daniel.Weigl@mycelium.com>
Message-ID: <516ecb1e-d8a8-719d-629b-59af808c1b6b@mycelium.com>
Date: Wed, 7 Sep 2016 11:42:24 +0200
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Subject: [bitcoin-dev] [cont'd] Derivation scheme for P2WPKH-nested-in-P2SH
	based accounts
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Hello again,

sorry, got a bit derailed on that proposal.
But now I think its time to work on it again.

- Any objections to get a BIP-number for it? 
	If not, can I get one, so I can finish up the test vectors.
	Current version: https://github.com/DanielWeigl/bips/blob/master/bip-p2sh-accounts.mediawiki 

- I decided against extending it for future P2WPKH addresses
	I think that should be a separate account on its own, to reduce implementation work 
	for future wallets, that only want/need to implement P2WPKH accounts. And to keep it simple.
	Was someone working on the P2WPKH address format in the meantime? (ie. alternative for [2])

- We will also need a extension to the BIP32 serialization format[1]
	It should be possible to export/import a xPriv/xPub key across compatible wallets, and they
	should be able without guesswork, fuzzy checks or asking the user to import the correct account type.
	Thinking about some flexible tag-based backwards compatible extensions - but thats a different BIP in itself.


Cheers,
Daniel


[1] https://github.com/DanielWeigl/bips/blob/master/bip-0032.mediawiki#Serialization_format
[2] https://github.com/bitcoin/bips/blob/master/bip-0142.mediawiki

On 2016-06-14 17:41, Daniel Weigl via bitcoin-dev wrote:
> Hi List,
> 
> Following up to the discussion last month ( https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2016-May/012695.html ), ive prepared a proposal for a BIP here:
> 	
> 	https://github.com/DanielWeigl/bips/blob/master/bip-p2sh-accounts.mediawiki
> 
> 
> Any comments on it? Does anyone working on a BIP44 compliant wallet implement something different?
> If there are no objection, id also like to request a number for it.
> 
> Thx,
> Daniel
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